Help identifying old crank

A quick learner says:
Hi, my house was built in 1956 with lots of awning type windows, being pre-AC Florida.

There is no branding on any of the parts. The bolt to bolt distance is 3.840 inches, as measured with a dial caliper. I am attaching several pictures.

These have been a bane to the family for over 50 years! I hope you can supply us with new ones.

User submitted photos of a window operator.
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Tom from SWISCO responded:
Thank you for posting. Could I see a few pictures of this operator removed from the window? That will help us identify what you need. Can you also tell me the distance between its screw holes, center-to-center?
A quick learner says:
Screw hole, center to center is the same as bolt head, center to center. I measured it three times, since 840/1000 inch doesn't match any fractional size.

I rather not pull an operator out unless absolutely necessary, they are old, and, um, "cranky." Fragile.

May I suggest seeing what you have that matches the hole center dimension and see if anything pops up. I might be able to use non-awning, regular casement gear boxes if that's all that's available. I'm a good pseudo-engineer.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for your patience in this matter. Unfortunately, I have not been able to find anything that matches those dimensions and that style. The closest I could find is our 39-182, however I am not sure if the arm will work for you. Without seeing it removed, I cannot find a better match.
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